Blood Pressure, PONV, Postoperative Recovery
Conditions
Keywords
Blood Pressure Variability, Minor- to moderate-risk noncardiac surgery
Brief summary
Intraoperative hypotension is associated with postoperative nausea and vomiting (PONV). Even though the exact mechanism linking PONV and hypotension is still unclear, a reduced intestinal tissue perfusion might trigger nausea and vomiting. Still to date only limited data evaluating intraoperative blood pressure and the incidence of PONV after general anesthesia exits. Furthermore, the effect of intraoperative blood pressure variability on the incidence of PONV has not been investigated yet. Therefore, we will test our primary hypothesis that the incidence of PONV during the early (0-2h) postoperative period will be minimized by targeting intraoperative blood pressure variability to a SPB of 120±5mmHg by using a continuous vasopressor infusion in female patients undergoing elective minor to moderate risk non-cardiac surgery.
Detailed description
Background: Intraoperative hypotension is associated with postoperative nausea and vomiting (PONV). Even though the exact mechanism linking PONV and hypotension is still unclear, a reduced intestinal tissue perfusion might trigger nausea and vomiting. Still to date only limited data evaluating intraoperative blood pressure and the incidence of PONV after general anesthesia exits. Furthermore, the effect of intraoperative blood pressure variability on the incidence of PONV has not been investigated yet. Therefore, we will test our primary hypothesis that the incidence of PONV during the early (0-2h) postoperative period will be minimized by targeting intraoperative blood pressure variability to a SPB of 120±5mmHg by using a continuous vasopressor infusion in female patients undergoing elective minor to moderate risk non-cardiac surgery. Methods: We will include 272 women between 18 and 50 years of age undergoing minor- to moderate-risk noncardiac surgery in this randomized, double-blinded clinical trial. Patients will randomly be assigned to intraoperative management of blood pressure with a SPB of 120±5mmHg (intervention group) or standard of care intraoperative blood pressure management (control group). Our primary outcome will be the incidence of PONV during the early (0-2h) postoperative period between the groups. Nausea will be assessed in 15-min intervals in the PACU for the first two postoperative hours on a 100mm visual analog scale. A PONV episode will be defined as the occurrence of nausea (VAS 50mm or greater) or vomiting. Statistics: The primary outcome, the incidence of PONV during the early (0-2 hours) postoperative period will be compared between the intervention and control group using a Chi- Square-Test. Level of originality: Data regarding the effects of intraoperative blood pressure on PONV are very limited and mainly available from retrospective analysis. So far, the effects of blood pressure variability on PONV have not been investigated yet. As PONV is still one of the most common complications after general anaesthesia leading to delayed discharge from PACU, patient discomfort and increased medical costs, it is important to search for additional methods to manage PONV. Our patient population, being at increased risk of PONV, could therefore profit from a more rapid postoperative recovery.
Interventions
OTHERMinimizing blood pressure variability
Intraoperative blood pressure management will be performed to maintain a systolic blood pressure of 120 ±5mmHg using a continuous infusion of a vasopressor starting at induction of anaesthesia.
Sponsors
Medical University of Vienna
Study design
Allocation
RANDOMIZED
Intervention model
PARALLEL
Primary purpose
PREVENTION
Masking
DOUBLE (Subject, Outcomes Assessor)
Eligibility
Sex/Gender
FEMALE
Age
18 Years to 50 Years
Healthy volunteers
No
Inclusion criteria
* Women 18-50 years of age at time of surgery * ASA physical status I and II * Scheduled for elective minor or moderate risk non-cardiac surgery with expected time of surgery ≥1 hour
Exclusion criteria
* Patients undergoing emergency surgery * Scheduled for pheochromocytoma surgery * Nausea and/or vomiting on the morning before surgery * Taking anti-emetic drugs * Pregnancy * Dysfunction of the vestibular system
Design outcomes
Primary
| Measure | Time frame | Description |
|---|---|---|
| PONV | First two postoperative hours | Incidence of postoperative nausea and vomiting within the first two postoperative hours. |
Secondary
| Measure | Time frame | Description |
|---|---|---|
| Secondary Outcome 1: Late PONV | First three postoperative days | Incidence of postoperative nausea and vomiting within the first three postoperative days |
| Secondary Outcome 2: Modified Aldrete Score | First two postoperative hours | A score to assess readiness of discharge from postanesthesia care unit (PACU). Patients can achieve 0-14 points in the modified Aldrete Score. A modified Aldrete Score \> 12 points signals that criteria for discharge from PACU have been fulfilled, a modified Aldrete Score \< 12 points signals that patients should stay in PACU. |
| Secondary Outcome 3: Ready for Hospital Discharge Scale | First three postoperative days | A score to evaluate patients' subjective readiness for hospital discharge. Patients can achieve 0-80 points in the Ready for Hospital Discharge Scale. Higher scores mean that patients are ready for hospital discharge, lower scores mean that patients are not ready for hospital discharge. |
Other
| Measure | Time frame | Description |
|---|---|---|
| Exploratory Outcome 1: Intraoperative cerebral oxygen saturation between study groups | Throughout surgery | Intraoperative non-invasive near-infrared spectroscopy for measurement of cerebral oxygenation. |
| Exploratory Outcome 2: Intraoperative cerebral oxygen saturation between patients, who experienced PONV, and patients without PONV | Throughout surgery and first two postoperative hours | Intraoperative non-invasive near-infrared spectroscopy for measurement of cerebral oxygenation. |
| Exploratory Outcome 3: Impact of Event Scale-Revised | Before surgery | A self-report measure to evaluate the presence of posttraumatic stress disorder. It consists of 22 items, which are rated on a 4-point scale ranging from 0 (not at all) to 4 (extremely). Values are added up for the avoidance subscale, the intrusion subscale and the hyperarousal subcale and X is calculated via the following formula: X = (-0,02 x Intrusion) + (0,07 x Avoidance) + (0,15 x Hyperarousal) - 4,36. A value for X \> 0 indicates the likely presence of PTSD. |
| Substudy 1: Preoperative Copeptin | Before surgery | Comparison between preoperative Copeptin concentrations between patients with and without PONV. |
Countries
Austria
Contacts
Primary ContactKatharina Horvath, MD
Outcome results
None listed